What we have here (as many of you nailed) is a Looking at Extra Cards infraction. It’s very tempting to call this a Game Rules Violation, however what has actually happened here is looking at too many cards. Remember that really all Game Play Errors are Games Rule Violations, it’s our job to see if they fit more appropriately into another infraction.

Now on to what this implies. Since Amy has committed Looking at Extra Cards, she receives a warning. We also have the additional fix of offsetting the information she has gained. The Grizzly Bears were revealed correctly, and as such can remain where they are. The Plains on the other hand needs to be reinserted into the library. In order to accomplish this we first (in accordance with the IPG) set aside any known cards, in this case Glory Seeker, re-randomize the library and then replace Glory Seeker on the bottom. The players may then continue happily! As for Nicholas, since the players called a judge quickly after the error happened, and before advantage could be gained, Failure to Maintain Gamestate does not apply.